Landslide-lake outburst floods accelerate downstream hillslope slippage
<p>The Jinsha River, which has carved a 2–4 km deep gorge, is one of the largest SE Asian rivers. Two successive landslide-lake outburst floods (LLFs) occurred after the 2018 Baige landslides along the river. Using Sentinel-2 images, we examined the LLF impacts on downstream river channels and...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-09-01
|
| Series: | Earth Surface Dynamics |
| Online Access: | https://esurf.copernicus.org/articles/9/1251/2021/esurf-9-1251-2021.pdf |
| _version_ | 1818366106590511104 |
|---|---|
| author | W. Yang J. Fang J. Liu-Zeng |
| author_facet | W. Yang J. Fang J. Liu-Zeng |
| author_sort | W. Yang |
| collection | DOAJ |
| description | <p>The Jinsha River, which has carved a 2–4 km deep gorge,
is one of the largest SE Asian rivers. Two successive landslide-lake
outburst floods (LLFs) occurred after the 2018 Baige landslides along the
river. Using Sentinel-2 images, we examined the LLF impacts on downstream
river channels and adjacent hillslopes over a 100 km distance. The floods
increased the width of the active river channel by 54 %. Subsequently,
major landslides persisted for 15 months in at least nine locations for
displacements <span class="inline-formula"><i>></i>2</span> m. Among them, three moving hillslopes
<span class="inline-formula">∼80</span> km downstream from the Baige landslides slumped more
than 10 m 1 year after the floods. Extensive undercuts by floods probably
removed hillslope buttresses and triggered a deformation response,
suggesting strong and dynamic channel–hillslope coupling. Our findings
indicate that infrequent catastrophic outburst flooding plays an important
role in landscape evolution. Persistent post-flood hillslope movement should
be considered in disaster mitigation in high-relief mountainous regions.</p> |
| first_indexed | 2024-12-13T22:30:53Z |
| format | Article |
| id | doaj.art-50df735faab84d64927a5769c9bd379b |
| institution | Directory Open Access Journal |
| issn | 2196-6311 2196-632X |
| language | English |
| last_indexed | 2024-12-13T22:30:53Z |
| publishDate | 2021-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth Surface Dynamics |
| spelling | doaj.art-50df735faab84d64927a5769c9bd379b2022-12-21T23:29:06ZengCopernicus PublicationsEarth Surface Dynamics2196-63112196-632X2021-09-0191251126210.5194/esurf-9-1251-2021Landslide-lake outburst floods accelerate downstream hillslope slippageW. Yang0J. Fang1J. Liu-Zeng2Three-gorges Reservoir Area (Chongqing) Forest Ecosystem Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, ChinaCollege of Urban and Environmental Sciences, Central China Normal University, Wuhan, 430079, ChinaInstitute of Surface–Earth System Science, Tianjin University, Tianjin, 300072, China<p>The Jinsha River, which has carved a 2–4 km deep gorge, is one of the largest SE Asian rivers. Two successive landslide-lake outburst floods (LLFs) occurred after the 2018 Baige landslides along the river. Using Sentinel-2 images, we examined the LLF impacts on downstream river channels and adjacent hillslopes over a 100 km distance. The floods increased the width of the active river channel by 54 %. Subsequently, major landslides persisted for 15 months in at least nine locations for displacements <span class="inline-formula"><i>></i>2</span> m. Among them, three moving hillslopes <span class="inline-formula">∼80</span> km downstream from the Baige landslides slumped more than 10 m 1 year after the floods. Extensive undercuts by floods probably removed hillslope buttresses and triggered a deformation response, suggesting strong and dynamic channel–hillslope coupling. Our findings indicate that infrequent catastrophic outburst flooding plays an important role in landscape evolution. Persistent post-flood hillslope movement should be considered in disaster mitigation in high-relief mountainous regions.</p>https://esurf.copernicus.org/articles/9/1251/2021/esurf-9-1251-2021.pdf |
| spellingShingle | W. Yang J. Fang J. Liu-Zeng Landslide-lake outburst floods accelerate downstream hillslope slippage Earth Surface Dynamics |
| title | Landslide-lake outburst floods accelerate downstream hillslope slippage |
| title_full | Landslide-lake outburst floods accelerate downstream hillslope slippage |
| title_fullStr | Landslide-lake outburst floods accelerate downstream hillslope slippage |
| title_full_unstemmed | Landslide-lake outburst floods accelerate downstream hillslope slippage |
| title_short | Landslide-lake outburst floods accelerate downstream hillslope slippage |
| title_sort | landslide lake outburst floods accelerate downstream hillslope slippage |
| url | https://esurf.copernicus.org/articles/9/1251/2021/esurf-9-1251-2021.pdf |
| work_keys_str_mv | AT wyang landslidelakeoutburstfloodsacceleratedownstreamhillslopeslippage AT jfang landslidelakeoutburstfloodsacceleratedownstreamhillslopeslippage AT jliuzeng landslidelakeoutburstfloodsacceleratedownstreamhillslopeslippage |